Algorithm 2: Evaluate the Accuracy of Time Synchronization

Get GNSS low-frequency trend $G_l$ by the VMD, Get speedometer displacement $V_{dis}$ by integral(Time period of $G_l$ is included in $V_{dis}$);

Initialize: $N_G\leftarrow size(G_l)$, $N_V\leftarrow size(V_{dis})$, $corre\_\max \leftarrow 0$, $corre\_\max \_n\leftarrow 0$;

For$n=1:(N_V-N_G)$ do   $temp\leftarrow corr(G_l,V_{dis}(n:n+N_G-1))$   If $temp>corre\_\max$     $corre\_\max \leftarrow temp,corre\_\max \_n\leftarrow n$;   End if End for

Return$corre\_\max$, $corre\_\max \_n$;